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The effects of private education on academic achievement by school grade: Using propensity score matching
Journal of the Korean Data & Information Science Society 2018;29:961-73
Published online July 31, 2018
© 2018 Korean Data and Information Science Society.

Seongcheol Park1 · Jinseub Hwang2

1Department of Statistics, Daegu University
2Division of Mathematics and Big Data Science, Daegu University
Correspondence to: Assistant professor, Division of Mathematics and Big Data Science, Daegu University, Gyeongbuk 38453, Korea. E-mail:
Received May 16, 2018; Revised July 5, 2018; Accepted July 9, 2018.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
The cost of private education in Korea has been steadily increasing over the past three years and many studies on the effect of private education have been made. Because the effects may be different by education and region we aim to compare the effects of private education by education and region based on national data. In this study we use the 2016 survey data on private education cost which is being included in the Statistics Korea’s Micro Data Integration Services. Of the total 82,751 subjects, we select 72,313 subjects except the subjects who variables considered in the analysis were missing. To adjust confounders, we use the propensity scores matching and examine the statistical significance of the interaction between private education status and region variables in order to identify regional difference. According to the results, private education is to be effective for the grade and there are no regional difference in elementary and middle schools. In high school, there are regional difference and private education is to be effective in Seoul, Gang-won, Jeonnam and Gyeong-gi but not in Incheon, Busan, Daegu, Gwangju, Daejeon, Ulsan, Sejong, Chungbuk, Chungnam, Jeonbuk, Gyeongbuk, Gyeongnam and Jeju.
Keywords : Grade, private education, propensity scores matching, region.